Version 4
SHEET 1 880 680
WIRE 144 -16 -64 -16
WIRE 272 -16 208 -16
WIRE 272 0 272 -16
WIRE -64 16 -64 -16
WIRE 272 112 272 80
WIRE 272 128 272 112
WIRE 176 176 112 176
WIRE 208 176 176 176
WIRE 272 256 272 224
FLAG 32 176 0
FLAG -64 96 0
FLAG 272 256 0
FLAG 176 176 B
FLAG 272 112 E
FLAG -64 -16 VCC
FLAG 272 -16 K
SYMBOL voltage 128 176 R90
WINDOW 0 -32 56 VBottom 0
WINDOW 3 32 56 VTop 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0V 0.76V 1MegHz)
SYMBOL res 256 -16 R0
SYMATTR InstName R1
SYMATTR Value 144
SYMBOL voltage -64 0 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 12.7V
SYMBOL npn 208 128 R0
SYMATTR InstName Q1
SYMATTR Value 2N2222
SYMBOL diode 144 0 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName D1
TEXT -40 264 Left 0 !.tran 0 6us 5us